Segment-saw



(No Model.)

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No. 279,344. Patented June 12,1883.V

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UNITED STATES PATENT OEEIcE.

JOHN OONNELL AND VALENTINE DENG-LER, OF ROCHESTER, NEV YORK.

SEGM ENT-SAW.

SPECIFICATION formingpart of Letters Patent No. 279,344, dated J' une 12, 1883. Application filed September 1G, 1881. (No model.)

l To all whom it may concern:

Beit known that we, JOHN CONNELL and VALENTINE DENG-LER, residents of the city of Rochester, county of Monroe, and State ofNew York, have ljointly invented certain Improvements in Segment-Saws, of which the follow-` ing is the speciiication, reference being had to the annexed drawings, in which- Figure lis a side elevation of our improved segment-saw for resawing-inachines. Fig. 2 is a vertical section thereof lon the line y y, Fig. 1. Fig. 3 is a vertical section, showing the modificati ons of th e construction of the saw. Fig. .4c is a section on the line xr, Fig. l, showing the mode ot' connecting the segments together by the dovetailed plates. Fig. 5 represents a crossfsection in the line z zi.

Our invention relates to an improved construction of segment-saws for use in resawingmachines; and it consists in attaching the sawsegments to the collar and shaft by means of a stiffening-plate secured to the collar and operating to hold the segments in place and to increase the rigidity ofthe saw.

Our invention also consists in the mechani cal details of the construction, as hereinafter more' fully set forth.

Our improved segment-saw for resawingmachines is represented in the accompanying drawings, in which D D D are the segments, N, the collar, a, the shaft, and l? the stiffeningplate Any desired number of segments maybe used in the construction of our improved saw, and they are secured together, so as to prevent springing sidewise, by one or more dovetailed plates, R, Figs. l and 4, placed near the peripheries of the, segments.

The collarN is placed on the board side of the saw, while the stiffening-plate is on the opposite or log side of the saw, that on which the thickest material passes when the machine is used for slabbing. The collar is provided with a central hub, which is attached to the saw-shaft c in any convenient manner-as, for instance, by means of a nut, t, forcing the hub against a shoulder or enlargement, O, on the shaft either with a without a key and slot. The flange of the collar projects outward a suitable distance from the hub, and the segments of which the saw is composed are secured to itby means of a row of screws, E',

the heads of which pass freely through holes in the stiifening-plat'e l?, so that the lat-ter can be removed without disturbing the screws.

The collar and stiifening-plates are secured together through the segments by the screws (t a., Fig. l, near their peripheries. The screws of the series E have square-shouldered heads, which pass through-the stiiiening-plate l) and bear on the segments only, while the screws a, c are provided with conical heads iitted'into countersnnk recesses in the stiffeningplate, and operating,when driven home, to bind the collar and stiifeningplate together near their outer margins and to clamp the segments, which are perforated to receive them, between the collar and the plate. The stiifening-plate is fastened to the collar inside the inner edges ot' the segments by the row or rows of screws F. It results from this construction that any one of the segments may be removed without taking off the plate l? by simply removing the screws E and a n which pass through it, while the stifteningplate may be detached by taking out the screws F and a a, leaving the screws of the series E, by which the segments are secured to the collar.

The segments are connected to each other near their peripheries by the dovetailed plates TR, Fig. 1, (shown also on alarger scale in Fig.

4, which represents a portion of the edge of one of the segments with one of the dovetailed plates in section.) Notches are cut inthe edges of the segments, the opposite sides of which notches are then beveled down from each side of the segments, and thc plates R, which are preferably of some duetile metal-such as copper-are fitted to the notches,

InV assembling the parts, the plates or keys in their completed form maybe insertedbetween the respective sections until the last one is reached. The plates by which this last section will be held are left open or ilat at one end, and after being slipped into position are' upset or spread by means of a hammer or punch to fit the adjacent surfaces. `When it is required to remove a section from the saw, one of the keys is removed by driving it from its place or cutting away the metal at one end, so as to admit of its being readily forced ont of position. The plates R bind the segments together, so as to make them as rigid practically as a saw made of one piece of steel,

IOO

while a saw made of segments is free from the warping or twisting caused by expansion from heat, which affects saws composed of a single piece only.

The collar may be made of cast-iron, in which case the hub would be cast with it; but we prefer to make the collar of a plate of steel, in Which case the hub may be dispensed witha mode of construction shown in Fig. 3.

The stiifening-plate is preferably made of tempered steel ground up true like a saw. This plate may be somewhat thinner than the collar, and it is reduced in thickness toward the periphery to a thin edge. By the use of the stiffening-plate the thickness of' the collar may be materially reduced7 the two together not being any thicker than tlie collar itself would be if used alone. XVe have found by practical experience that saws provided with the stiffening-platc fastened to the collar at or near their peripheries possess many advantages over those heretofore in use, in which the segments have been screwed onto the collar.v These advantages are principally the increased stiffness 'which is secured, and the facility which is afforded for the removal and insertion of any individual saw-segment without the necessity of' removing or displacing the others or of removing the stiff'ening-plate.

A stiffening-plate may be placed on each side of the saw, as represented in Fig. 3, the collar being provided with a ilange or tongue to which the stif't'ening-plates or one oi' them are secured.

Inserted teeth, as represented at U, Fig. l, may be employed in the segments of' our im proved saw.

Te claim l. In asegment-saw, the flange N, in combination with the stiffening-plate l), the intermediate saW-segments, D, and thescrews E, uniting the segments and the flanges, said screws being passed loosely through the plate P, in the manner described and sliowmwhereby the removal of the plate and of' the sawsections independently of each yother is permitted. Y n Y 2. In a sectional saw, the combination of' a flange, N, shouldered or recessed on its side face, the saw-segments seated in and against the said face, the stiffening-plate l), overlap ping the surfaces of the segments and the flange, the screws F, uniting the flange and the plate, and the screws E, uniting the segments Aand the flange and seated at their heads loosely within the plate.

3. In a sectional saw, the combination of the flange N, the stiii'ening-plate l?, the interme diate saw-segments, D, screws uniting the flange and the plate and the ilange and segments, and keys R, uniting the edges of the adjacent segments near the periphery, as described and shown.

JOHN CON NELL.

VALENTNE DENGLER.

Vitnesses (ino. B. SELDEN, THos. R. GRIFFITH. 

